Sofa



FIG. 1 is a front perspective view of a sofa showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is rear elevation view thereof;

FIG. 5 is a back perspective view thereof; and,

FIG. 6 is a front perspective view of thereof with environmental subject matter shown in dotted lines.

The broken lines in the drawings represent environmental subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a sofa, as shown and described. 